MCQ Range of Hearing and Ultrasound Chapter 11 Class 9 Science

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MCQ’s For All Chapters – Science Class 9th

1. The audible range of sound for human beings is

Question 1 of 20

2. Sounds of frequency below 20 Hz are called

Question 2 of 20

3. Sounds of frequency above 20000 Hz are called

Question 3 of 20

4. Which animal can hear sounds up to 25 kHz?

Question 4 of 20

5. As people grow older, their ears become

Question 5 of 20

6. Which animals communicate using infrasound?

Question 6 of 20

7. Before earthquakes, some animals get disturbed because

Question 7 of 20

8. The vibrations of a pendulum fall under which sound category?

Question 8 of 20

9. Ultrasound is produced by

Question 9 of 20

10. Moths can detect bats because

Question 10 of 20

11. The hearing aid converts sound waves into

Question 11 of 20

12. The amplified electrical signals in a hearing aid are sent to

Question 12 of 20

13. Ultrasound is used for cleaning because

Question 13 of 20

14. Ultrasound can detect cracks in metal blocks because

Question 14 of 20

15. Ordinary sound waves cannot be used to detect defects because

Question 15 of 20

16. The technique of forming images of the heart using ultrasound is called

Question 16 of 20

17. Ultrasonography is used to

Question 17 of 20

18. During ultrasonography, ultrasonic waves are reflected from

Question 18 of 20

19. Ultrasonography is used during pregnancy to

Question 19 of 20

20. Ultrasound can be used to break kidney stones because

Question 20 of 20


 

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